Sms Group Gmbh

Sms Siemag Aktiengesellschaft

Sms Demag Ag

Thomas Pasch

Rolf Degel

Dieter Borgwardt

Roland Koenig

Andreas Haaks

Harmen Johannes Oterdoom

Ralf Nörthemann

Mesut Göcoglu

Roland Konig

Juergen Kunze

Roland KÖNIG

A method for operating an electric arc furnace having at least one electrode, the method including the following steps: introducing material that is to be melted in the form of an actual mass flow into the electric arc furnace and feeding electrical energy via at least one electrode into the electric arc furnace in order to melt the introduced material depending on a previously determined, necessary electrical energy input. The necessary electrical energy input into the arc furnace is determined depending on the mass flow input into the furnace.

Method for operating an electric arc furnace

The invention relates to an electronic circuit and a method for feeding power to at least one electrode of an alternating-current electric-arc furnace, particularly for melting metal. Known circuits of this type typically comprise a series connection with a transformer for providing a supply voltage for the electric-arc furnace from a power grid () and a AC power controller () connected between the transformer () and the electrode () for regulating the current through the electrode (). According to the invention, a further development for such electronic circuits is proposed, which development has a simple design, is inexpensive and prevents overload of the AC power controller () even in operating modes of the electric-arc furnaces at high electrode currents. This further development provides to bypass the AC power controller with a bypass switch () that is opened or closed with the help of a controller as a function of the amount of current flowing through the electrode ().

Electronic circuit and method of supplying electricity

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Erkrath, Germany

Thomas Pasch